OPERATION & MAINTENANCE MANUAL TC670E - RTI Technologies

RTI Technologies, Inc.EXAMPLE:The level of liquid visible in the TC670E Charging Cylinder Sight Glass is 7.4 lbs.and the A/C system capacity is 3.2 lbs. The following calculation results...(7.4) - (3.2) = 4.2Therefore, the sliding indicator should be set at 4.2 lbs. in this example. When theliquid level lowers to the 4.2 lb. mark, a charge of 3.2 lbs. will have been deliveredNOTE...The Sight Glass on the Charging Cylinder has markings for both R12 andR134a. Always use the correct scale for accurate charging.6. Open Red Hose Valve. Do not start the Vehicle's Engine. Refrigerant will flow into the highside of the A/C System. Closely monitor the liquid level as it lowers in the Charging CylinderSight Glass.7. Close High Gauge Valve as soon as the refrigerant level drops to the sliding indicator.9. Press bottom (OFF) of rocker switch marked CHARGE/HIGH SIDE.The vehicle can now be started and the A/C system checked by monitoring Gauge pressures.Evacuate the hoses per the preceding section "Hose Evacuation"Always close all valves before disconnecting hoses.NOTE:The preceding is the recommended method of charging with the TC670E.Some vehicle manufacturers may specify connecting only to the Low Side of theA/C System. Always follow the manufacturer’s recommended procedures. Theabove instructions would have to be modified accordingly.September 19, 1997 Page 13